It's always a good day for me when I get to see a Melies film that's new to me. This one turned up on the Cinematheque Francais site. It is listed as #70 in his catalogue, and the film is preceded by a look at Melies' camera, an affair of wood and brass.
It's a standard magic trick, making a lady vanish. The sharp-eyed audience will be able to tell this is accomplished by camera trickery, rather than the sort Melies would use on the stage of his beloved Theatre Robert-Houdin. However, while making her vanish is easily accomplished, bringing her back is a more cumbersome procedure.